Here is a quick and dirty method I use all the time. The function below will only get the user to select the folder they want to start at - I think the simplest way to limit access to a given path is to perhaps check GetFolderName below against the path(s) you want to restrict e.g.
If GetFolderName = "C:\" then
MsgBox("This folder is not for you buddy")
Exit Sub
end if
Also not my code :)
Public Function GetFolderName(Optional OpenAt As String) As String
Dim lCount As Long
GetFolderName = vbNullString
With Application.FileDialog(msoFileDialogFolderPicker)
.InitialFileName = OpenAt
.Show
For lCount = 1 To .SelectedItems.Count
GetFolderName = .SelectedItems(lCount)
Next lCount
End With
End Function